| Code | Label | Definition | 
                                                                
                                                                
                                                                    
                                                                        | A | Marine habitats | Marine habitats | 
                                                                    
                                                                        | A1 | Littoral rock and other hard substrata | Littoral rock and other hard substrata | 
                                                                    
                                                                        | A1.1 | Littoral rock very exposed to wave actio... | Littoral rock very exposed to wave actio... | 
                                                                    
                                                                        | A1.2 | Littoral rock moderately exposed to wave... | Littoral rock moderately exposed to wave... | 
                                                                    
                                                                        | A1.3 | Littoral rock sheltered from wave action | Littoral rock sheltered from wave action | 
                                                                    
                                                                        | A1.4 | Rock habitats exposed by action of wind ... | Rock habitats exposed by action of wind ... | 
                                                                    
                                                                        | A1.5 | Rockpools | Rockpools | 
                                                                    
                                                                        | A1.6 | Littoral caves and overhangs | Littoral caves and overhangs | 
                                                                    
                                                                        | A1.11 | Mussels and/or barnacles on very exposed... | Mussels and/or barnacles on very exposed... | 
                                                                    
                                                                        | A1.12 | Robust fucoids or red seaweeds on very e... | Robust fucoids or red seaweeds on very e... | 
                                                                    
                                                                        | A1.13 | Communities of the upper mediolittoral r... | Communities of the upper mediolittoral r... | 
                                                                    
                                                                        | A1.14 | Communities of the lower mediolittoral r... | Communities of the lower mediolittoral r... | 
                                                                    
                                                                        | A1.21 | Mussels and/or barnacles on littoral roc... | Mussels and/or barnacles on littoral roc... | 
                                                                    
                                                                        | A1.22 | Fucoids and barnacles on moderately expo... | Fucoids and barnacles on moderately expo... | 
                                                                    
                                                                        | A1.23 | Red seaweeds on moderately exposed litto... | Red seaweeds on moderately exposed litto... | 
                                                                    
                                                                        | A1.24 | Ephemeral green or red seaweeds (freshwa... | Ephemeral green or red seaweeds (freshwa... | 
                                                                    
                                                                        | A1.25 | Mussels and fucoids on moderately expose... | Mussels and fucoids on moderately expose... | 
                                                                    
                                                                        | A1.26 | [Sabellaria] reefs on littoral rock | [Sabellaria] reefs on littoral rock | 
                                                                    
                                                                        | A1.27 | Communities of the lower mediolittoral r... | Communities of the lower mediolittoral r... | 
                                                                    
                                                                        | A1.31 | Dense fucoids on sheltered littoral rock | Dense fucoids on sheltered littoral rock | 
                                                                    
                                                                        | A1.32 | Fucoids, barnacles or ephemeral seaweeds... | Fucoids, barnacles or ephemeral seaweeds... | 
                                                                    
                                                                        | A1.33 | Mussel beds on sheltered littoral mixed ... | Mussel beds on sheltered littoral mixed ... | 
                                                                    
                                                                        | A1.34 | Red algal turf in lower eulittoral, shel... | Red algal turf in lower eulittoral, shel... | 
                                                                    
                                                                        | A1.35 | Communities of the lower mediolittoral r... | Communities of the lower mediolittoral r... | 
                                                                    
                                                                        | A1.41 | Hydrolittoral soft rock | Hydrolittoral soft rock | 
                                                                    
                                                                        | A1.42 | Hydrolittoral solid rock (bedrock) | Hydrolittoral solid rock (bedrock) | 
                                                                    
                                                                        | A1.43 | Hydrolittoral hard clay | Hydrolittoral hard clay | 
                                                                    
                                                                        | A1.44 | Hydrolittoral [Mytilus edulis] beds | Hydrolittoral [Mytilus edulis] beds | 
                                                                    
                                                                        | A1.45 | Hydrolittoral peat | Hydrolittoral peat | 
                                                                    
                                                                        | A1.51 | Communities of littoral rockpools | Communities of littoral rockpools | 
                                                                    
                                                                        | . . . | . . . | . . . |